CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE (cont)

TM 9-2320-366-20-3

m6. CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE

m6.

(CONT)

KNOWN INFO

TEST OPTIONS

Circuit breaker OK.

Continuity Test or

Power supplied to CTIS.

STE/ICE-R Test #91

Is continuity verified on

REASON FOR QUESTION

Speedometer OK.

indicator display lights

CTIS overspeed indicator

Indicator display lights OK.

socket 9 to socket 17?

will not work if continuity

CTIS cable-speed signal

is not present from indicator

OK.

display lights socket 9 to

Cab dashboard wiring

socket 17.

harness - speed signal OK.

Cab dashboard wiring

harness - LED input to

CTIS cable OK.

CTIS cable - LED input

to ECU OK.

Replace lighted indicator

ECU - O.S. pressure

YES

display (para 7-16).

change function OK.

POSSIBLE PROBLEMS

Faulty overspeed indicator

LED.

Faulty cab dashboard

wiring harness - ground

for LED.

Faulty cab dashboard

wiring harness - power

to LED.

Faulty CTIS cable power

to LED.

Faulty ECU - O.S. warning

indicator function.

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